| 摘要 |
An objection of the invention is to provide a projection height measuring method and a projection height measuring apparatus capable of measuring a height of a projection with high accuracy. A projection height measuring method includes: an imaging step for imaging an area on a surface of a workpiece including a projection, which is an object to be measured, at an angle of depression; a projection area extracting step for extracting a projection area from an image, by classifying an area in the image into a bright area, a dark area and an intermediate area based on brightness values in the image imaged by the imaging step, and regarding an area composed of the bright area and the dark area as the projection area corresponding to the projection and regarding an area composed of the intermediate area as a work area corresponding to the workpiece; a diameter/generatrix measuring step for measuring a length of a diameter corresponding portion corresponding to a bottom surface diameter portion of the projection area extracted by the projection area extracting step and a length of a generatrix corresponding portion corresponding to a generatrix portion of the projection area; a storing step for storing in advance a prescribed value of the diameter corresponding portion; a judging step for judging whether the length of the diameter corresponding portion measured by the diameter/generatrix measuring step is within a predetermined range with respect to the stored prescribed value of the diameter corresponding portion; a determining step for determining the stored prescribed value of the diameter corresponding portion as a calculation value used when calculating the height of the projection when it is judged that the measured length of the diameter corresponding portion is not within the predetermined range by the judging step; and a height calculating step for calculating the height of the projection based on the calculation value determined by the determining step, the length of the generatrix corresponding portion and the angle of depression.
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